$ DEFINE DASD DASDUNIT 1100 DASDTYPE=3390-3 cyl=8000 trk=0 DASDUNIT 1200 DASDTYPE=3390-3 cyl=8000 trk=0 $ ENDDASD
有了合适的工具、耐心和探索精神，就能在自己的硬件上领略大型机计算的魅力。
如果你在这个过程中遇到挑战，你并不孤单。其他用户在使用z/OS 2.1镜像时也遇到过类似问题。
Happy Mainframing!
IBM occasionally offers free limited-time access to a modern z/OS mainframe environment via the web (z/OS Trial) which does not require local installation. This is useful for learning JCL and ISPF but does not run on a local Hercules instance. hercules z os 21 download link
Mainframe users interact via text-based 3270 terminals. You will need a TN3270 emulator to connect to the local IP address and port defined in your Hercules networking configuration. Popular options include:
This is the modern, actively maintained fork of Hercules. It features improved z/Architecture support, better performance, and bug fixes essential for running newer operating systems.
0x0190 3390 "C:\path\to\your\ADCD\volumes\SYS01.CKD" 0x0191 3390 "C:\path\to\your\ADCD\volumes\SYS02.CKD"
: an open-source software implementation of the mainframe architecture that allows a standard PC to emulate a powerful System/370, ESA/390, and z/Architecture. The Quest for z/OS 2.1 The specific interest in a "download link" for z/OS version 2.1 $ DEFINE DASD DASDUNIT 1100 DASDTYPE=3390-3 cyl=8000 trk=0
Creating a feature for to emulate z/OS 2.1 involves several technical and legal considerations. Below is a structured guide to help users set up Hercules for z/OS 2.1 simulation, including download instructions and configuration steps. Note : z/OS is proprietary software, and downloading it requires a valid IBM license.
Avoid any website claiming to offer a direct download of z/OS disk images. These files are unauthorized copies and may contain corrupted data or malware.
A free learning platform provided by IBM. It grants students and hobbyists direct, legal access to a real, modern z/OS environment via a web browser and VS Code extensions.
To actually interact with the system once it's running, you will also need: Mainframe users interact via text-based 3270 terminals
You cannot just "run" z/OS 2.1. You need a conf file. Create a file called zos21.cnf :
Hercules由Roger Bowler创建，Jay Maynard维护。Jan Jaeger设计了众多高级功能，包括动态重新配置、集成控制台、解释执行和z/Architecture支持。Hercules是开源的，其许可证包括QPL（Q公共许可证）。
: You need this to "see" the mainframe screen. x3270 (Linux/macOS)
Run Hercules, load your config file ( hercules -f zos21.cnf ), and type ipl 83f at the Hercules prompt.